JPWO2017135338A1 - Polyamide resin composition - Google Patents

Abstract

  The polyamide resin (A) includes a polyamide resin (A) and a glass fiber (B). The polyamide resin (A) has a crystalline polyamide resin (A-1) and an MVR measured at a temperature of 275 ° C. and a load of 5 kg based on ISO 1133 at 50 ml / ml. Including an amorphous polyamide resin (A-2) that is 10 minutes or longer, and the glass fiber (B) includes a glass fiber (B-1) having a non-circular cross section, and the total content of the glass fiber (B). A resin composition having a rate of 40% by mass to 80% by mass is provided.

Description

  The present invention relates to a polyamide resin composition.

  Polyamide resin can realize high rigidity and the like by blending glass fibers. However, since glass fibers have a property of being oriented in the resin flow direction, anisotropy of strength may occur and cause warping. As a technique for realizing low warpage, a technique for blending a glass fiber having a flat cross section has been proposed (see, for example, Patent Documents 1 and 2). Further, as a technique for realizing high vibration resistance characteristics, a glass fiber reinforced polyamide resin composition in which aliphatic polyamide and polymetaxylene adipamide are used in combination with glass fiber having a specific cross-sectional area has been proposed (for example, patents). Reference 3).

Japanese Patent Laid-Open No. 10-2119026 International Publication No. 2008/120703 International Publication No. 2014/171363

However, in the prior art, it may be difficult to achieve a good surface appearance when a molded product is formed while maintaining high rigidity and low warpage.
An object of the present invention is to provide a polyamide resin composition capable of realizing high rigidity, low warpage and good surface appearance in a molded product.

Specific means for solving the above problems are as follows.
The polyamide resin (A) and the glass fiber (B) are included, and the polyamide resin (A) includes a single type of crystalline polyamide resin (A-1) and an amorphous polyamide resin (A-2), The glass fiber (B) is a polyamide resin composition including a glass fiber (B-1) having a non-circular cross section, and a total content of the glass fiber (B) is 40% by mass or more and 80% by mass or less.

  ADVANTAGE OF THE INVENTION According to this invention, the polyamide resin composition which can implement | achieve high rigidity, low curvature, and a favorable surface appearance in a molded article can be provided.

  In the present specification, the content of each component in the composition is the total amount of the plurality of substances present in the composition unless there is a specific notice when there are a plurality of substances corresponding to each component in the composition. means.

[Polyamide resin composition]
The polyamide resin composition of the present embodiment includes a polyamide resin (A) and glass fiber (B), and the polyamide resin (A) is based on crystalline polyamide resin (A-1) and ISO 1133 at a temperature of 275 ° C., Including an amorphous polyamide resin (A-2) having an MVR measured at a load of 5 kg of 50 ml / 10 min or more, and the glass fiber (B) includes a glass fiber (B-1) having a non-circular cross section, The total content rate of the said glass fiber (B) is 40 to 80 mass%. Forming a molded product by blending non-circular cross-section glass fiber (B-1) with a specific content in crystalline polyamide resin (A-1) and specific amorphous polyamide resin (A-2) In this case, a good surface appearance can be realized while maintaining high rigidity and low warpage.

Polyamide resin (A)
The polyamide resin composition comprises at least one kind of crystalline polyamide resin (A-1) as a polyamide resin and an amorphous polyamide having an MVR measured at a temperature of 275 ° C. and a load of 5 kg based on ISO 1133 of 50 ml / 10 min or more. And at least one resin (A-2). Combined with the crystalline polyamide resin (A-1) and the amorphous polyamide resin (A-2) having a specific MVR value, the molded article is good while maintaining high rigidity and low warpage. Surface appearance can be realized.

Crystalline polyamide resin (A-1)
The crystalline polyamide resin (A-1) in this specification means a polyamide resin that exhibits a clear endothermic peak due to melting in a differential scanning calorimeter (DSC) analysis under a temperature rising condition of 10 ° C./min. Specifically, it means a polyamide resin having a heat of crystal fusion exceeding 1 cal / g.

  Examples of the crystalline polyamide resin (A-1) include an aliphatic polyamide resin composed of an aliphatic diamine and an aliphatic dicarboxylic acid, and an aliphatic polyamide resin composed of a lactam or an aminocarboxylic acid. The crystalline polyamide resin (A-1) is preferably an aliphatic polyamide resin.

  As the monomer component constituting the aliphatic polyamide resin, an aliphatic diamine having 2 to 20 carbon atoms, preferably 4 to 12 carbon atoms, and an aliphatic dicarboxylic acid having 2 to 20 carbon atoms, preferably 6 to 12 carbon atoms. Examples thereof include a combination, a lactam having 6 to 12 carbon atoms, and an aminocarboxylic acid.

  Aliphatic diamines include ethylene diamine, tetramethylene diamine, pentamethylene diamine, hexamethylene diamine, peptamethylene diamine, octamethylene diamine, nonamethylene diamine, decamethylene diamine, undecamethylene diamine, dodecamethylene diamine, tridecane diamine, Examples include tetradecane diamine, pentadecane diamine, hexadecane diamine, heptadecane diamine, octadecane diamine, nonadecane diamine, and eicosane diamine. Aliphatic dicarboxylic acids include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedione Examples include acid, pentadecanedioic acid, hexadecanedioic acid, octadecanedioic acid, and eicosandioic acid.

  Examples of combinations of aliphatic diamines and aliphatic dicarboxylic acids include hexamethylene diamine and adipic acid, hexamethylene diamine and sebacic acid, hexamethylene diamine and dodecanedioic acid, etc. A salt is preferably used.

  Examples of the lactam include ε-caprolactam, enantolactam, undecane lactam, dodecane lactam, α-pyrrolidone, α-piperidone and the like. Examples of the aminocarboxylic acid include 6-aminocaproic acid, 7-aminoheptanoic acid, 9-aminononanoic acid, 11-aminoundecanoic acid, and 12-aminododecanoic acid. Among these, from the viewpoint of polymerization production, at least one selected from the group consisting of ε-caprolactam, undecane lactam and dodecane lactam is preferable.

  The monomer component constituting the aliphatic polyamide resin may be a single type or a combination of two or more types. Here, the combination of the aliphatic diamine and the aliphatic dicarboxylic acid is regarded as one monomer component by a combination of one kind of aliphatic diamine and one kind of aliphatic dicarboxylic acid.

From the viewpoint of productivity, the crystalline polyamide resin (A-1) is polyamide 6, polyamide 66, polyamide 6/66, polyamide 6/12, polyamide 610, polyamide 612, polyamide 6/66/12, polyamide 11 and polyamide. It is preferably selected from the group consisting of 12, and polyamide 6 and / or polyamide 66 is more preferred.
The crystalline polyamide resin (A-1) may be used alone or in combination of two or more. When two or more kinds of crystalline polyamide resins are included, the total content of other crystalline polyamide resins with respect to the crystalline polyamide resin having the largest content is, for example, 25% by mass or less, and preferably 5% by mass or less.

  The relative viscosity of the crystalline polyamide resin (A-1) is not particularly limited, but relative to the crystalline polyamide resin (A-1) having a concentration of 1% in 98% sulfuric acid measured at 25 ° C. according to JIS K 6810. The viscosity is preferably 1.8 or more and 5.0 or less.

  From the viewpoint of mechanical properties and surface appearance, the content of the crystalline polyamide resin (A-1) in the total amount of the polyamide resin composition is, for example, preferably 20% by mass or more and less than 60% by mass, and 30% by mass or more and 50% by mass. The following is more preferable.

Amorphous polyamide resin (A-2)
The amorphous polyamide resin (A-2) in the present specification means a polyamide resin in which crystallization hardly occurs or the crystallization rate is very small. Specifically, in a differential scanning calorimeter (DSC) analysis under a temperature rising condition of 10 ° C./min, it means a polyamide resin that does not show a clear endothermic peak due to melting, and the heat of crystal melting is 1 cal / g or less. It means that there is.
The amorphous polyamide resin (A-2) has an MVR measured at a temperature of 275 ° C. and a load of 5 kg based on ISO 1133 of 50 ml / 10 minutes or more, preferably 60 ml / 10 minutes or more. If the MVR is less than 50 ml / 10 minutes, it may be difficult to achieve a good surface appearance in the molded body. The upper limit of MVR is, for example, 200 ml / min, preferably 100 ml / min.
When two or more kinds of amorphous polyamide resins are contained, they are mixed to measure the MVR of the entire amorphous polyamide resin, and the MVR measured at a temperature of 275 ° C. and a load of 5 kg based on ISO 1133 is 50 ml / 10 minutes. When it is the above, the whole amorphous polyamide resin can be made into an amorphous polyamide resin (A-2). The measurement of MVR is preferably performed as described above. However, when the MVR of each amorphous polyamide resin and the mixing ratio thereof are known, the value obtained by multiplying each MVR by the mixing ratio is summed up. The average value calculated as above can be used as the MVR of the entire amorphous polyamide resin.

  The amorphous polyamide resin (A-2) is preferably a polyamide resin having a structure that inhibits crystallization. For example, an aliphatic, alicyclic, or aromatic functional group having a branched structure has a main chain. Or the polyamide which has in a side chain is mentioned. Further, from the viewpoint of inhibiting crystallization, a copolymer is more preferable. The amorphous polyamide resin (A-2) is preferably a copolymerized polyamide resin containing at least two aromatic monomer components, for example, and the peak temperature of the loss elastic modulus at the time of absolute drying obtained by measuring dynamic viscoelasticity. It is more preferable that the glass transition temperature calculated | required by (100) is 100 degreeC or more. The polymerization method of the amorphous polyamide may be a known method and is not particularly limited.

  Examples of the dicarboxylic acid constituting the amorphous polyamide resin (A-2) include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,4-phenylenedioxydiacetic acid, 1,3-phenylenedioxydiacetic acid, dibenzoic acid, 4,4′-oxydibenzoic acid, diphenylmethane-4,4′-dicarboxylic acid, diphenylsulfone-4,4 ′ -Aromatic dicarboxylic acids such as dicarboxylic acid and 4,4'-biphenyldicarboxylic acid; and alicyclic dicarboxylic acids such as 1,3-cyclopentanedicarboxylic acid and 1,4-cyclohexanedicarboxylic acid.

  Examples of the diamine constituting the amorphous polyamide resin (A-2) include alicyclic diamines such as cyclohexanediamine, methylcyclohexanediamine, and isophoronediamine; p-phenylenediamine, m-phenylenediamine, p-xylenediamine, Examples include aromatic diamines such as m-xylenediamine, 4,4′-diaminodiphenylmethane, 4,4′-diaminodiphenylsulfone, and 4,4′-diaminodiphenylether.

  Specifically, as the amorphous polyamide resin (A-2), a polycondensate of isophthalic acid / terephthalic acid / hexamethylenediamine / bis (3-methyl-4-aminocyclohexyl) methane, terephthalic acid / 2,2, 4-trimethylhexamethylenediamine / 2,4,4-trimethylhexamethylenediamine polycondensate, isophthalic acid / bis (3-methyl-4-aminocyclohexyl) methane / ω-laurolactam polycondensate, isophthalic acid / Polycondensate of terephthalic acid / hexamethylenediamine (polyamide 6T / 6I), polycondensate of isophthalic acid / 2,2,4-trimethylhexamethylenediamine / 2,4,4-trimethylhexamethylenediamine, isophthalic acid / terephthalate Acid / 2,2,4-trimethylhexamethylenediamine / 2,4,4-tri Polycondensate chill hexamethylenediamine, a polycondensate of isophthalic acid / bis (3-methyl-4-aminocyclohexyl) methane / .omega.-laurolactam can be cited. Among these, the amorphous polyamide resin (A-2) is preferable because, for example, a copolymer having an aromatic ring such as polyamide 6T / 6I inhibits crystallization of the crystalline polyamide resin.

Specifically, the amorphous polyamide resin (A-2) is preferably composed of 40 to 95 mol% of terephthalic acid component units and 5 to 60 mol% of isophthalic acid component units and an aliphatic diamine. Preferable combinations of the monomer components constituting the amorphous polyamide resin (A-2) include an equimolar salt of hexamethylene diamine and terephthalic acid and an equimolar salt of hexamethylene diamine and isophthalic acid.
Further, the amorphous polyamide resin (A-2) includes a unit derived from a monomer component composed of an aliphatic diamine, isophthalic acid, and terephthalic acid in an amount of 60% by mass to 99% by mass, and the unit of the aliphatic polyamide component. A copolymer containing 1 to 40% by mass is preferable.

  The relative viscosity of the amorphous polyamide resin (A-2) is not particularly limited. However, according to JIS K 6810, the amorphous polyamide resin (A-2) having a concentration of 1% in 98% sulfuric acid is at a temperature of 25 ° C. The measured relative viscosity is preferably 1.5 to 4.0, more preferably 1.8 to 3.0.

  The content of the amorphous polyamide resin (A-2) in the total amount of the polyamide resin composition is preferably 0.5% by mass or more and 30% by mass or less from the viewpoint of mechanical properties and surface appearance, and is 0.5% by mass. It is more preferably 20% by mass or less, more preferably 3% by mass or more and 25% by mass or less, more preferably 3% by mass or more and 20% by mass or less, and further preferably 3% by mass or more and 8% by mass or less. The polyamide resin composition may contain one kind of amorphous polyamide resin or two or more kinds in combination.

Glass fiber (B)
The polyamide resin composition includes at least non-circular cross-sectional glass fibers (B-1) as glass fibers (B), and the total content of glass fibers (B) is 40% by mass or more and 80% by mass or less. Thereby, in a molded article, a favorable surface appearance can be realized while maintaining high rigidity and low warpage.

Non-circular cross-section glass fiber (B-1)
The glass fiber (B-1) having a non-circular cross section is not particularly limited as long as the cross-section is non-circular. The non-circular cross section means that, in a cross section perpendicular to the length direction of the glass fiber, out of two points on the outer periphery of the cross section, the long diameter connecting the two points where the distance is maximum, and the outer periphery of the cross section among the straight lines orthogonal to the long diameter There is a minor axis connecting two points where the distance between two points intersecting with each other is the maximum, and the major axis and the minor axis have different lengths. The ratio of the major axis to the minor axis of the glass fiber may be larger than 1, and is, for example, 1.2 or more and 10 or less, preferably 1.5 or more and 6 or less, and preferably 1.7 or more and 4.5 or less from the viewpoint of mechanical properties. Is more preferable.

  As a cross-sectional shape of the glass fiber (B-1) having a non-circular cross section, an eyebrow shape, an oval shape, a semicircular shape, an arc shape, a rectangular shape, a parallelogram shape, or a similar shape thereof is usually used. Practically, eyebrows, ovals, or rectangles are preferable from the viewpoints of fluidity, mechanical properties, and low warpage. For a specific example of the cross-sectional shape of the non-circular cross-sectional glass fiber (B-1), reference can be made to, for example, the description of JP-A-62-2268612.

The thickness of the glass fiber (B-1) having a non-circular cross section is not particularly limited. The short diameter of the glass fiber (B-1) having a non-circular cross section is usually from 0.5 μm to 25 μm, and the long diameter is from 1.25 μm to 300 μm.
The glass fiber (B-1) having a non-circular cross section uses a glass fiber having a fiber length of usually 1 mm to 15 mm, preferably 1.5 mm to 12 mm, more preferably 2 mm to 6 mm.
The aspect ratio obtained by dividing the fiber length by the average value of the major axis and minor axis of the non-circular cross-section glass fiber (B-1) is usually 10 or more, from the viewpoint of rigidity, mechanical strength, and fluidity, 15 or more and 100 or less are preferable.

  As glass which comprises the glass fiber (B-1) of a non-circular cross section, what consists of compositions, such as A glass, C glass, E glass, is mentioned, E glass is preferable from a viewpoint of the thermal stability of a polyamide resin. . The glass fiber (B-1) having a non-circular cross section may be surface-treated with a silane coupling agent, a titanium coupling agent, other polymer or a low molecular surface treatment agent. By being surface-treated, dispersibility and adhesion in the polyamide resin are improved. Moreover, it is preferable that the glass fiber (B-1) of a non-circular cross section is converged with the convergence material from a viewpoint of improving adhesiveness with resin. The converging material is not particularly limited, and is preferably a urethane resin and / or an acrylic resin from the viewpoint of compatibility with the polyamide resin.

  The content of the non-circular cross-section glass fiber (B-1) in the total amount of the polyamide resin composition is preferably 15% by mass or more and 70% by mass or less from the viewpoint of high rigidity, low warpage, and good surface appearance. 20 mass% or more and 65 mass% or less are more preferable.

Glass fiber with a circular cross section (B-2)
The polyamide resin composition may further contain glass fibers (B-2) having a circular cross section in addition to glass fibers (B-1) having a non-circular cross section as glass fibers. The glass fiber (B-2) having a circular cross section is a glass fiber having a circular cross section perpendicular to the length direction of the glass fiber. The average fiber diameter of the glass fiber (B-2) having a circular cross section is, for example, 4 μm or more and 15 μm or less, and more preferably 6 μm or more and 13 μm or less. When the average fiber diameter is within the above range, the mechanical properties and dimensional stability of the molded product tend to be further improved. In addition, the average fiber diameter of glass fiber (B-2) of a circular cross section can be measured according to JIS R3420.

The glass fiber (B-2) having a circular cross section has a fiber length of usually 1 mm or more and 15 mm or less, preferably 1.5 mm or more and 12 mm or less, more preferably 2 mm or more and 6 mm or less.
The aspect ratio obtained by dividing the fiber length by the average fiber diameter of glass fibers having a circular cross section is usually 10 or more, and preferably 15 or more and 100 or less from the viewpoint of rigidity, mechanical strength, and fluidity.

  As glass which comprises the glass fiber of a circular section, what consists of compositions, such as A glass, C glass, E glass, is mentioned, E glass is preferable from a viewpoint of the thermal stability of a polyamide resin. The glass fiber having a circular cross section may be surface-treated with a silane coupling agent, a titanium coupling agent, other polymer or a low molecular surface treatment agent. By being surface-treated, dispersibility and adhesion in the polyamide resin are improved. Moreover, it is preferable that the glass fiber of a circular cross section is converged with the convergence material from a viewpoint of improving adhesiveness with resin. The converging material is not particularly limited, and is preferably a urethane resin and / or an acrylic resin from the viewpoint of compatibility with the polyamide resin.

When the polyamide resin composition includes a glass fiber (B-2) having a circular cross section, the content of the glass fiber (B-2) having a circular cross section in the total amount of the polyamide resin composition is 5% by mass or more and 40% by mass. From the viewpoint of high rigidity, low warpage and good surface appearance, it is more preferably 10% by mass or more and 35% by mass or less.
Further, the content ratio (B-2 / B-1) of the glass fiber (B-2) having a circular cross section and the glass fiber (B-1) having a non-circular cross section is high in rigidity, low warpage, and good surface appearance. From a viewpoint, 0.1 or more and 1.2 or less are preferred, and 0.3 or more and 1.0 or less are more preferred.

  In the polyamide resin composition, other components such as a plasticizer, an impact-resistant material, a heat-resistant material, a foaming agent, a weathering agent, a crystal nucleating agent, a crystallization accelerator, and a release agent may be used as long as the effects of the present invention are not impaired. Further, a functional agent such as a lubricant, an antistatic agent, a flame retardant, a flame retardant aid, a pigment, and a dye can be appropriately blended.

The polyamide resin composition comprises a crystalline polyamide resin (A-1), an amorphous polyamide resin (A-2), and a predetermined amount of non-circular cross-sectional glass fiber (B-1), a uniaxial or biaxial extruder, Manufactured by melt-kneading with a Banbury mixer or the like.
A desired molded article can be obtained by molding the resulting polyamide resin composition. As a molding method, an extrusion molding method, a blow molding method, an injection molding method, or the like can be adopted.

  Since the molded body containing the polyamide resin composition of the present embodiment exhibits a good surface appearance, it is suitably used for various applications such as automobile parts and those requiring a design, casings and the like. Moreover, about the molded object obtained by injection-molding a polyamide resin composition, the glossiness (gloss value) measured according to ASTM D-523 is preferably 65% or more, and more preferably 70% or more.

The polyamide resin composition of this embodiment provides high rigidity, low warpage and good surface appearance in a molded product.
(Mechanical properties)
In the molded body containing the polyamide resin composition of the present embodiment, the tensile strength measured at 23 ° C. according to ISO 527-1 and 2 is preferably 265 MPa or more.
In the molded body containing the polyamide resin composition of the present embodiment, the tensile elastic modulus measured at 23 ° C. according to ISO527-1, 2 is preferably 20 GPa or more.
In the molded body containing the polyamide resin composition of the present embodiment, the Charpy impact strength measured at 23 ° C. according to ISO 179-1 is preferably 20 kJ / m ² .
In addition, the tensile strength and the tensile modulus can be measured by the following methods. An ISO standard TYPE-A test piece is produced by injection molding and used to acquire mechanical property data. The tensile strength and the tensile modulus are measured at 23 ° C. using an Instron tensile tester model 5567 according to ISO527-1,2.
The Charpy impact strength can be measured by the following method. In accordance with ISO 179-1, Yasuda Seiki Charpy Impact Tester No. Using a 258-PC, an edgewise impact test is performed using a test piece having a thickness of 4 mm with an A notch at 23 ° C. (N = 10)

(Liquidity)
In the molded body containing the polyamide resin composition of the present embodiment, the flow length measured under the following conditions is preferably 85 mm or more.
Using PS-40E (screw diameter: 26 mm, clamping force: 40 ton) manufactured by Nissei Plastic Industrial Co., Ltd., using a spiral flow type fluidity evaluation mold having a cavity size of width w = 15 mm and thickness t = 1 mm. The flow length is measured from the obtained molded product. The molding conditions are a molding temperature of 290 ° C., a mold temperature of 80 ° C., and an injection pressure of 100 MPa.

(Surface appearance (Glossiness) (Gloss))
In the molded body containing the polyamide resin composition of the present embodiment, the gloss (gloss value) measured under the following conditions is preferably 65% or more, and more preferably 70% or more.
A plate 100 mm × 70 mm × thickness 2 mm is prepared using SE100D-C160S (screw diameter 28 mm, clamping force 100 ton) manufactured by Sumitomo Heavy Industries, Ltd. The molding conditions are a molding temperature of 290 ° C., a mold temperature of 80 ° C., an injection speed of 80 mm / sec, and a cooling time of 15 seconds. The glossiness (gloss value) of the obtained test piece is measured at an incident angle of 60 ° using a color computer SM-5-IS-2B manufactured by Suga Test Instruments Co., Ltd. according to ASTM D-523.

(Warp deformation)
In the molded body containing the polyamide resin composition of the present embodiment, low warpage can be evaluated by the following method.
A D-1 type mold 60 mm × 60 mm × thickness 1 t of ISO294-3 is created using SE100D-C160S (screw diameter 28 mm, clamping force 100 ton) manufactured by Sumitomo Heavy Industries, Ltd. The molding conditions are a molding temperature of 290 ° C., a mold temperature of 80 ° C., an injection speed of 97 mm / second, an injection pressure of 60 MPa, and a cooling time of 15 seconds. The gate is cut immediately after molding and left in the moisture-proof container for 48 hours, and a weight is placed on the specified corner on the surface plate, and the maximum gap with the surface plate is defined as the amount of warping deformation. When the obtained deformation amount is 3 mm or more, warp deformation is present, and when it is less than 3 mm, warp deformation is absent.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to these Examples. In addition, the physical property evaluation method of resin used in an Example and a comparative example and a molded article is shown below.

[Mechanical properties]
An ISO standard TYPE-A test piece was prepared by injection molding and used for data acquisition of mechanical properties. The tensile strength and tensile modulus were measured at 23 ° C. using an Instron tensile tester model 5567 according to ISO527-1,2.

[Charpy impact strength]
In accordance with ISO 179-1, Yasuda Seiki Charpy Impact Tester No. Using 258-PC, an edgewise impact test was performed using a test piece having a thickness of 4 mm with an A notch at 23 ° C. (N = 10)

[Liquidity]
Using PS-40E (screw diameter: 26 mm, clamping force: 40 ton) manufactured by Nissei Plastic Industrial Co., Ltd., using a spiral flow type fluidity evaluation mold having a cavity size of width w = 15 mm and thickness t = 1 mm. The flow length was measured from the obtained molded product. The molding conditions were a molding temperature of 290 ° C., a mold temperature of 80 ° C., and an injection pressure of 100 MPa.

[Glossiness (Gloss)]
A plate 100 mm × 70 mm × thickness 2 mm was prepared using SE100D-C160S (screw diameter 28 mm, clamping force 100 ton) manufactured by Sumitomo Heavy Industries, Ltd. The molding conditions were a molding temperature of 290 ° C., a mold temperature of 80 ° C., an injection speed of 80 mm / sec, and a cooling time of 15 seconds. The glossiness (gross value) of the obtained test piece was measured at an incident angle of 60 ° using a color computer SM-5-IS-2B manufactured by Suga Test Instruments Co., Ltd. according to ASTM D-523.

[Warpage deformation]
Using ISO100D-C160S (screw diameter 28 mm, mold clamping force 100 ton) manufactured by Sumitomo Heavy Industries, Ltd., a D-1 type mold 60 mm × 60 mm × thickness 1 t of ISO294-3 was created. The molding conditions were a molding temperature of 290 ° C., a mold temperature of 80 ° C., an injection speed of 97 mm / second, an injection pressure of 60 MPa, and a cooling time of 15 seconds. The gate was cut immediately after molding and left in a moisture-proof container for 48 hours, and a weight was placed on the specified corner on the surface plate, and the maximum gap with the surface plate was defined as the amount of warping deformation. The case where the obtained deformation amount was 3 mm or more was warp deformation, and the case where the deformation amount was less than 3 mm was not warp deformation.

・ Polyamide resin (A)
・ Crystalline polyamide resin (A-1)
PA6-1: According to JIS K 6810, a crystalline polyamide resin with a concentration of 1% in 96% sulfuric acid has a relative viscosity of 2.43 to 2.51 measured at 25 ° C., and from caprolactam having 6 carbon atoms. Polyamide 6
PA6-2: According to JIS K 6810, a crystalline polyamide resin with a concentration of 1% in 96% sulfuric acid has a relative viscosity of 2.16 to 2.25 measured at 25 ° C., and from caprolactam having 6 carbon atoms. Polyamide 6
-Amorphous polyamide resin-Amorphous polyamide resin (A-2) based on ISO 1133 with an MVR measured at a temperature of 275 ° C and a load of 5 kg of 50 ml / 10 min or more
PA6T / 6I-1: Grivory G16 (manufactured by EMS-CHEMIE (Japan)) whose MVR measured at a temperature of 275 ° C. and a load of 5 kg was 100 ml / 10 minutes based on ISO1133
PA6T / 6I-2: Grivory G21 (manufactured by EMS-CHEMIE (Japan)) whose MVR measured at a temperature of 275 ° C. and a load of 5 kg based on ISO 1133 was 25 ml / 10 min.

Glass fiber GF1: Glass fiber with a non-circular cross section (CSG3PA-820S manufactured by Nittobo Co., Ltd.)
Ratio of major axis to minor axis 4 and fiber diameter 7 × 28μm
GF2: Glass fiber having a circular cross section (CS 3DE-456S manufactured by Nitto Boseki Co., Ltd.)
Average fiber diameter 6μm
GF3: Glass fiber with a circular cross section (ECS 03T-249, manufactured by Nippon Electric Glass Co., Ltd.)
Average fiber diameter 13μm

・ PA6 black MB
Black masterbatch (UBE NYLON 1013MBC manufactured by Ube Industries, Ltd.) containing a dye component and a pigment component in polyamide 6 base

・ Molding aid-2
Pentalit (Guangei Chemical Industry Co., Ltd.)
・ Molding aid-2
LICOWAX OP POWDER (manufactured by Clariant Japan Co., Ltd.)

・ Heat-resistant agent CuI, KI mixture (weight ratio 1: 6)
CuI Cuprous iodide F (made by Ise Chemical Co., Ltd.)
KI Powdered potassium iodide (Mitsui Fine Co., Ltd.)

Examples 1 to 9, Comparative Examples 1 to 8
The polyamide resin and glass fiber described in Table 1 were melt-kneaded with a TEX44HCT biaxial kneader to produce a target polyamide resin composition pellet.
Next, various test pieces were produced using the obtained pellets, and various physical properties were evaluated. The obtained results are shown in Table 1. In Table 1, “-” means not blended.

  As is apparent from the results in Table 1, it can be seen that when a molded product is formed using the polyamide resin composition of the present invention, high rigidity, low warpage and good surface appearance can be achieved.

The disclosure of Japanese Patent Application No. 2006-018653 (filing date: February 3, 2016) is incorporated herein by reference in its entirety.
All documents, patent applications, and technical standards mentioned in this specification are to the same extent as if each individual document, patent application, and technical standard were specifically and individually stated to be incorporated by reference, Incorporated herein by reference.

Claims (8)

Including polyamide resin (A) and glass fiber (B),
The polyamide resin (A) is composed of a crystalline polyamide resin (A-1) and an amorphous polyamide resin (A-2) having an MVR measured at a temperature of 275 ° C. and a load of 5 kg based on ISO 1133 of 50 ml / 10 min or more. ) And
The glass fiber (B) includes a glass fiber (B-1) having a non-circular cross section,
The polyamide resin composition whose total content rate of the said glass fiber (B) is 40 to 80 mass% with respect to the polyamide resin composition whole quantity.   2. The polyamide resin composition according to claim 1, wherein the glass fiber (B-1) having a non-circular cross section has a ratio of a major axis to a minor axis in a cross section perpendicular to the length direction of 1.2 to 10. The glass fiber (B) is further
The polyamide resin composition of Claim 1 or 2 containing the glass fiber (B-2) of a circular section with an average fiber diameter of 4 micrometers or more and 15 micrometers or less.   The content rate of the said amorphous polyamide resin (A-2) is 0.5 mass% or more and 20 mass% or less with respect to the polyamide resin composition whole quantity, The polyamide resin composition in any one of Claims 1-3. .   The crystalline polyamide resin (A-1) is selected from the group consisting of polyamide 6, polyamide 66, polyamide 6/66, polyamide 6/12, polyamide 610, polyamide 612, polyamide 6/66/12, polyamide 11 and polyamide 12. The polyamide resin composition according to any one of claims 1 to 4, which is selected.   The polyamide resin composition according to any one of claims 1 to 5, wherein the amorphous polyamide resin (A-2) contains polyamide 6T / 6I.   The polyamide resin composition according to any one of claims 1 to 6, wherein the glass fiber (B-1) content of the non-circular cross section is 5% by mass or more and 70% by mass or less based on the total amount of the polyamide resin composition.   The molded article containing the polyamide resin composition in any one of Claims 1-7.